Which tool should be used to measure the thickness of a scored rotor?

• A. Caliper with digital readout
• B. Outside micrometer with pointed anvil and spindle
• C. Vernier scale
• D. Dial indicator

Answer: (B)

To accurately measure the thickness of a scored rotor, the best approach is to use an outside micrometer with a pointed anvil and spindle. This tool is designed for precision measurement of small distances and can provide a very accurate reading of the rotor's thickness, even in the presence of scoring, which can be irregular and may not allow for as reliable a reading with less precise tools.

The outside micrometer works by allowing the anvil to make contact with the rotor at specific points, providing a direct measurement that can be read on its scale. The pointed anvil is particularly useful because it can sit on the edges of scored areas or irregularities without being affected by minor variances in the rotor's surface, ensuring that the actual metallic thickness is measured effectively.

Other tools, while useful in various applications, are not as well suited for this specific measurement. For instance, calipers might not offer the same level of precision needed for such small measurements, and variances in measurement due to their design can lead to inaccuracies. A vernier scale, while helpful for general measurements, also lacks the precision that a micrometer provides and is less effective for measuring thickness in scenarios where detail matters. As for the dial indicator, it is primarily intended for measuring variations in